中文摘要：

2008年春、夏、秋和水华发生末期,对三峡水库小江回水区的原生动物、轮虫群落进行了调查,共监测到原生动物52种、轮虫35种;其中,原生动物秋季种类最多,有30种,轮虫夏季种类较多,有25种。水华发生末期的现存量最高,但多样性指数最低。理化参数的多因素方差分析、聚类分析结果表明,小江回水区水环境具有明显的时间异质性。从物种组成聚类结果来看,不同时间的原生动物和轮虫群落组成不同,且与水环境的时间异质性并不一致。浮游动物现存量与环境因子关系的冗余分析（RDA）结果显示,水温与浮游动物群落现存量呈显著正相关。

英文摘要：

The studies on the characteristics of protozoan and rotifer communities in backwater region of Xiaojiang were carried out in 2008. Totally,52 species of protozoa and 35 species of rotifer were found, autumn. The species number of protozoa was the highest in autumn （30） , and rotifer species were the most abundant in summer（25）. At the end of algae bloom period, their densities and biomasses were the highest than in the other seasons, but their biodiversity indexes were the lowest. From the results of muhifactor analysis of variance and cluster analyses, it was found that the physical and chemical factors had significant temporal heterogeneity. The cluster analyses of species composition showed that protozoa and rotifer communities differed among the diffferent periods and their changes were not same with the temporal heterogeneity of envionmental factors. The abundances of zooplankton communities was analyzed in relation to water quality parameters by redundancy analysis （RDA）. Temperature were positively correlated with the zooplankton community abundances.